Nothing useful in terms of MSX was released in North America. When I say Japanese only I mean in terms of the countries that were lucky enough to get MSX releases besides the pisspoor MSX1 stuff. That's the reason why the Turbo R doesnt have alot of software. Only one country got the model, whereas the other stuff was spread all over.
a Turbo R can run anything ever released for the MSX line of computers, and the list of exclusive titles isn't much. Illusion City is one of the only ones of any consequence.
an MSX2+ isn't really that much different than a 2. It usually has some extra feature, usually MSX-MUSIC built in. Nothing groundbreaking that makes it a must-have. FM-PACs are cheap and have SRAM so they're good to buy anyhow.
NA people have to import either way, so if a Philips NMS8250 is just as available as an HB-F1XD/XDJ/XV , it wont make much difference which one you get. In fact the Philips 8250 is easier to open and replace things, has room for 2 FDDs, and has 128k ram stock, so its actually better than a stock Japanese MSX2.